/// <summary>
/// Returns a strongly typed collection of specific sensor types.
/// </summary>
/// <typeparam name="T">The type of the sensors to retrieve.</typeparam>
/// <returns>A strongly types list of sensors.</returns>
public static SensorList <T> GetSensorsByTypeId <T>() where T : Sensor
{
object[] attrs = typeof(T).GetCustomAttributes(typeof(SensorDescriptionAttribute), true);
if (attrs != null && attrs.Length > 0)
{
SensorDescriptionAttribute sda = attrs[0] as SensorDescriptionAttribute;
ISensorCollection nativeSensorCollection = null;
HResult hr = sensorManager.GetSensorsByType(sda.SensorTypeGuid, out nativeSensorCollection);
if (hr == HResult.ElementNotFound)
{
throw new SensorPlatformException(LocalizedMessages.SensorsNotFound);
}
return(nativeSensorCollectionToSensorCollection <T>(nativeSensorCollection));
}
return(new SensorList <T>());
}
public static SensorList <S> GetSensorsByTypeId <S>( )
where S : Sensor
{
object[] attrs = typeof(S).GetCustomAttributes(typeof(SensorDescriptionAttribute), true);
if (attrs != null && attrs.Length > 0)
{
SensorDescriptionAttribute sda = attrs[0] as SensorDescriptionAttribute;
ISensorCollection nativeSensorCollection = null;
HRESULT hr = sensorManager.GetSensorsByType(sda.SensorTypeGuid, out nativeSensorCollection);
if (hr == HRESULT.E_ELEMENTNOTFOUND)
{
throw new SensorPlatformException("No sensors found. Are any sensor drivers installed?");
}
return(nativeSensorCollectionToSensorCollection <S>(nativeSensorCollection));
}
else
{
return(new SensorList <S>());
}
}
/// <summary>
/// Interrogates assemblies currently loaded into the AppDomain for classes deriving from <see cref="Sensor"/>.
/// Builds data structures which map those types to sensor type GUIDs.
/// </summary>
private static void BuildSensorTypeMap( )
{
Assembly[] loadedAssemblies = AppDomain.CurrentDomain.GetAssemblies( );
foreach (Assembly asm in loadedAssemblies)
{
try
{
Type[] exportedTypes = asm.GetExportedTypes( );
foreach (Type t in exportedTypes)
{
if (t.IsSubclassOf(typeof(Sensor)) && t.IsPublic && !t.IsAbstract && !t.IsGenericType)
{
object[] attrs = t.GetCustomAttributes(typeof(SensorDescriptionAttribute), true);
if (attrs != null && attrs.Length > 0)
{
SensorDescriptionAttribute sda = (SensorDescriptionAttribute)attrs[0];
SensorTypeData stm = new SensorTypeData(t, sda);
guidToSensorDescr.Add(sda.SensorTypeGuid, stm);
sensorTypeToGuid.Add(t, sda.SensorTypeGuid);
}
}
}
}
catch (System.NotSupportedException)
{
// GetExportedTypes can throw this if dynamic assemblies are loaded
// via Reflection.Emit.
}
catch (System.IO.FileNotFoundException)
{
// GetExportedTypes can throw this if a loaded asembly is not in the
// current directory or path.
}
}
}
public SensorTypeData(Type sensorClassType, SensorDescriptionAttribute sda)
{
sensorType = sensorClassType;
this.sda = sda;
}
public void Construction(string sensorTypeGuid)
{
SensorDescriptionAttribute a = new SensorDescriptionAttribute(sensorTypeGuid);
Assert.Equal<string>(sensorTypeGuid, a.SensorType);
}
